January 9th, 2009, 03:48 PM
Problem in message handling
First off, please check below code. Well, I am developing printing functionality from the windows mobile device using vc++. (I am novice to the vc++ ). For printing, we are using third party DLLs. Below are important snippet required to explain the complete picture. Currently, the problem I am more concerning is printing multiple pages. For this, we have API and everything. While printing using “mpPreviewDialog” API (provided by third party in form of DLL) and when it recognize more than one pages required, it raises/passes “MP_EVENT_REQ_NEW_PAGE” message from printing library, ie mpPreviewDialog itself, to the handle hWnd of “mpPreviewDialog(hWnd,__)”. Now, to handle this message, we have put all logic portion in one class which is inherited from CWnd so that we can override “DefWindowProc” function to achieve our goal. But while I run the application and command print for multiple page, it only prints the first page perfectly and then just get hanged. Thus, it fails to handle the “MP_EVENT_REQ_NEW_PAGE” message of “DefWindowProc” function. What all I need is to handle this message and execute the case MP_EVENT_REQ_NEW_PAGE: while printing and multiple page required. Because in this case it issues the message but appropriate case never get executed. I hope you got my point. Please let me know how to solve this. Am I missing something? Thank you very much for your time in advance.
class CFxPrinterWnd : public CWnd
CFxPrinterWnd(); // protected constructor used by dynamic creation
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
int PrintReport(HWND hwnd, int flg);
virtual LRESULT DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam);
Int CFxPrinterWnd::PrintReport (HWND hWnd, int flg)
This contains “mpPreviewDialog” API call which starts printing and issue “MP_EVENT_REQ_NEW_PAGE” message if more than one page required.
Case MP_EVENT_REQ_NEW_PAGE: //This debug point never get focused while printing and new page required.
___This point is never get executed
Button1 Click Event
hWnd = ::FindWindow(NULL, _T(“del”));
Ret = wnd.PrintReport(hWnd, 0);
mpPreviewDialog (hWnd____); //This is the printing API where MP_EVENT_REQ_NEW_PAGE message get raised while printing if new page
Last edited by Andreas Masur; January 10th, 2009 at 09:07 AM.
Reason: Added code tags...
January 10th, 2009, 04:15 AM
Re: Problem in message handling
You should edit your post adding Code tags around your code snippet. Otherwise the code is unreadable.
Originally Posted by 02mca31
Check out the Announcement: Before you post....
Click Here to Expand Forum to Full Width
This is a CodeGuru survey question.